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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 30, 2020 USD ($) $ / shares shares | Oct. 19, 2020 | Oct. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) segment | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 6,348,000 |  | $ 6,348,000 |  | $ 5,286,000 |  |  |  |  |
Accumulated deficit |  |  |  | 257,681,000 |  | 257,681,000 |  | 230,864,000 |  |  |  |  |
Stockholders’ deficit |  |  |  | 255,176,000 | $ 222,059,000 | $ 255,176,000 | $ 222,059,000 | 228,539,000 | $ 246,445,000 | $ 238,234,000 | $ 212,519,000 | $ 205,713,000 | $ 198,030,000
Number of operating segments | segment |  |  |  |  |  | 1 |  |  |  |  |  |  |
Comprehensive loss |  |  |  |  |  | $ 0 | 0 |  |  |  |  |  |
Allowance for doubtful accounts |  |  |  | 200,000 |  | 200,000 |  | 200,000 |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Goodwill impairments loss |  |  |  | 0 | $ 0 | 0 | $ 0 |  |  |  |  |  |
Deferred revenue |  |  |  | 5,673,000 |  | $ 5,673,000 |  | 1,283,000 |  |  |  |  |
Patent |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Developed Technology |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  | 9 years |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful Lives |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful Lives |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Other Current Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  | 200,000 |  | $ 200,000 |  | 200,000 |  |  |  |  |
Inventory balances |  |  |  | 3,200,000 |  | 3,200,000 |  | 800,000 |  |  |  |  |
Deferred offering costs |  |  |  | 1,400,000 |  | 1,400,000 |  | 0 |  |  |  |  |
Money Market Funds |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 4,800,000 |  | 4,800,000 |  | $ 4,800,000 |  |  |  |  |
Testing Services |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  | $ 3,500,000 |  | $ 3,500,000 |  |  |  |  |  |  |
Accounts Receivable | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 17.00% |  | 18.00% |  |  |  |  |
Accounts Receivable | Diagnostic Tests | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 61.00% | 58.00% |  |  |  |  |  |
Diagnostic Test Revenue | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  | 63.00% | 57.00% | 61.00% | 58.00% |  |  |  |  |  |
Customer One | Accounts Receivable | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 10.00% |  | 44.00% |  |  |  |  |
Customer One | Accounts Receivable | Diagnostic Tests | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 35.00% |  | 0.00% |  |  |  |  |
Two Service Customers | Service Revenue | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  | 53.00% | 85.00% |  |  |  |  |  |
Health Care Provider | Diagnostic Test Revenue | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  | 62.00% |  | 42.00% |  |  |  |  |  |  |
IPO |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, description |  |  |  |  |  | 0.1684664-for-1 |  |  |  |  |  |  |
IPO | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds | $ 63,000,000.0 |  | $ 63,000,000.0 |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  | 0.1684664 |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued and sold | shares | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock price per share | $ / shares | $ 18.00 |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock and convertible notes payable converted into shares of common stock | shares | 21,939,025 |  |  |  |  |  |  |  |  |  |  |  |

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